<!DOCTYPE html>
<p>Test that a column spanner affects preferred intrinsic widths on a multicol container correctly.</p>
<p>There should be a green square, and no red, below.</p>
<div style="width:-webkit-fit-content; -webkit-columns:3; background:red;">
    <div style="-webkit-column-span:all;">
        <div style="width:200px; height:200px; background:green;"></div>
    </div>
</div>
